lib/libcr/net/gethostnamadr.c

   1 /*-
   2  * Copyright (c) 1994, Garrett Wollman
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND
  14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  16  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  19  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  23  * SUCH DAMAGE.
  24  */
  25
  26 #if defined(LIBC_SCCS) && !defined(lint)
  27 static char sccsid[] = "@(#)$FreeBSD: src/lib/libc/net/gethostnamadr.c,v 1.15.2.2 2001/03/05 10:40:42 obrien Exp $";
  28 static char rcsid[] = "$FreeBSD: src/lib/libc/net/gethostnamadr.c,v 1.15.2.2 2001/03/05 10:40:42 obrien Exp $";
  29 #endif /* LIBC_SCCS and not lint */
  30
  31 #include <sys/param.h>
  32 #include <sys/socket.h>
  33 #include <netinet/in.h>
  34 #include <arpa/inet.h>
  35 #include <netdb.h>
  36 #include <stdio.h>
  37 #include <ctype.h>
  38 #include <string.h>
  39 #include <arpa/nameser.h>               /* XXX hack for _res */
  40 #include <resolv.h>                     /* XXX hack for _res */
  41
  42 #define _PATH_HOSTCONF  "/etc/host.conf"
  43
  44 enum service_type {
  45   SERVICE_NONE = 0,
  46   SERVICE_BIND,
  47   SERVICE_HOSTS,
  48   SERVICE_NIS };
  49 #define SERVICE_MAX     SERVICE_NIS
  50
  51 static struct {
  52   const char *name;
  53   enum service_type type;
  54 } service_names[] = {
  55   { "hosts", SERVICE_HOSTS },
  56   { "/etc/hosts", SERVICE_HOSTS },
  57   { "hosttable", SERVICE_HOSTS },
  58   { "htable", SERVICE_HOSTS },
  59   { "bind", SERVICE_BIND },
  60   { "dns", SERVICE_BIND },
  61   { "domain", SERVICE_BIND },
  62   { "yp", SERVICE_NIS },
  63   { "yellowpages", SERVICE_NIS },
  64   { "nis", SERVICE_NIS },
  65   { 0, SERVICE_NONE }
  66 };
  67
  68 static enum service_type service_order[SERVICE_MAX + 1];
  69 static int service_done = 0;
  70
  71 static enum service_type
  72 get_service_name(const char *name) {
  73         int i;
  74         for(i = 0; service_names[i].type != SERVICE_NONE; i++) {
  75                 if(!strcasecmp(name, service_names[i].name)) {
  76                         return service_names[i].type;
  77                 }
  78         }
  79         return SERVICE_NONE;
  80 }
  81
  82 static void
  83 init_services()
  84 {
  85         char *cp, *p, buf[BUFSIZ];
  86         register int cc = 0;
  87         FILE *fd;
  88
  89         if ((fd = (FILE *)fopen(_PATH_HOSTCONF, "r")) == NULL) {
  90                                 /* make some assumptions */
  91                 service_order[0] = SERVICE_BIND;
  92                 service_order[1] = SERVICE_HOSTS;
  93                 service_order[2] = SERVICE_NONE;
  94         } else {
  95                 while (fgets(buf, BUFSIZ, fd) != NULL && cc < SERVICE_MAX) {
  96                         if(buf[0] == '#')
  97                                 continue;
  98
  99                         p = buf;
 100                         while ((cp = strsep(&p, "\n \t,:;")) != NULL && *cp == '\0')
 101                                 ;
 102                         if (cp == NULL)
 103                                 continue;
 104                         do {
 105                                 if (isalpha((unsigned char)cp[0])) {
 106                                         service_order[cc] = get_service_name(cp);
 107                                         if(service_order[cc] != SERVICE_NONE)
 108                                                 cc++;
 109                                 }
 110                                 while ((cp = strsep(&p, "\n \t,:;")) != NULL && *cp == '\0')
 111                                         ;
 112                         } while(cp != NULL && cc < SERVICE_MAX);
 113                 }
 114                 service_order[cc] = SERVICE_NONE;
 115                 fclose(fd);
 116         }
 117         service_done = 1;
 118 }
 119
 120 struct hostent *
 121 gethostbyname(const char *name)
 122 {
 123         struct hostent *hp;
 124
 125         if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
 126                 h_errno = NETDB_INTERNAL;
 127                 return (NULL);
 128         }
 129         if (_res.options & RES_USE_INET6) {             /* XXX */
 130                 hp = gethostbyname2(name, AF_INET6);    /* XXX */
 131                 if (hp)                                 /* XXX */
 132                         return (hp);                    /* XXX */
 133         }                                               /* XXX */
 134         return (gethostbyname2(name, AF_INET));
 135 }
 136
 137 struct hostent *
 138 gethostbyname2(const char *name, int type)
 139 {
 140         struct hostent *hp = 0;
 141         int nserv = 0;
 142
 143         if (!service_done)
 144                 init_services();
 145
 146         while (!hp) {
 147                 switch (service_order[nserv]) {
 148                       case SERVICE_NONE:
 149                         return NULL;
 150                       case SERVICE_HOSTS:
 151                         hp = _gethostbyhtname(name, type);
 152                         break;
 153                       case SERVICE_BIND:
 154                         hp = _gethostbydnsname(name, type);
 155                         break;
 156                       case SERVICE_NIS:
 157                         hp = _gethostbynisname(name, type);
 158                         break;
 159                 }
 160                 nserv++;
 161         }
 162         return hp;
 163 }
 164
 165 struct hostent *
 166 gethostbyaddr(const char *addr, int len, int type)
 167 {
 168         struct hostent *hp = 0;
 169         int nserv = 0;
 170
 171         if (!service_done)
 172                 init_services();
 173
 174         while (!hp) {
 175                 switch (service_order[nserv]) {
 176                       case SERVICE_NONE:
 177                         return 0;
 178                       case SERVICE_HOSTS:
 179                         hp = _gethostbyhtaddr(addr, len, type);
 180                         break;
 181                       case SERVICE_BIND:
 182                         hp = _gethostbydnsaddr(addr, len, type);
 183                         break;
 184                       case SERVICE_NIS:
 185                         hp = _gethostbynisaddr(addr, len, type);
 186                         break;
 187                 }
 188                 nserv++;
 189         }
 190         return hp;
 191 }
 192
 193 #ifdef _THREAD_SAFE
 194 struct hostent_data;
 195
 196 /*
 197  * Temporary function (not thread safe)
 198  */
 199 int gethostbyaddr_r(const char *addr, int len, int type,
 200         struct hostent *result, struct hostent_data *buffer)
 201 {
 202         struct hostent *hp;
 203         int ret;
 204         if ((hp = gethostbyaddr(addr, len, type)) == NULL) {
 205                 ret = -1;
 206         } else {
 207                 memcpy(result, hp, sizeof(struct hostent));
 208                 ret = 0;
 209         }
 210         return(ret);
 211 }
 212 #endif
 213
 214 void
 215 sethostent(stayopen)
 216         int stayopen;
 217 {
 218         _sethosthtent(stayopen);
 219         _sethostdnsent(stayopen);
 220 }
 221
 222 void
 223 endhostent()
 224 {
 225         _endhosthtent();
 226         _endhostdnsent();
 227 }